diff options
Diffstat (limited to 'src/Text/Pandoc/Readers/Markdown.hs')
| -rw-r--r-- | src/Text/Pandoc/Readers/Markdown.hs | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/src/Text/Pandoc/Readers/Markdown.hs b/src/Text/Pandoc/Readers/Markdown.hs index 50780b379..502abae9a 100644 --- a/src/Text/Pandoc/Readers/Markdown.hs +++ b/src/Text/Pandoc/Readers/Markdown.hs @@ -31,7 +31,7 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Conversion of markdown-formatted plain text to 'Pandoc' document. -} -module Text.Pandoc.Readers.Markdown ( readMarkdown ) where +module Text.Pandoc.Readers.Markdown ( readMarkdown, yamlToMeta ) where import Prelude import Control.Monad @@ -246,11 +246,23 @@ yamlMetaBlock = try $ do updateState $ \st -> st{ stateMeta' = (stateMeta' st) <> newMetaF } return mempty +-- | Read a YAML string and convert it to pandoc metadata. +-- String scalars in the YAML are parsed as Markdown. +yamlToMeta :: PandocMonad m => BS.ByteString -> m Meta +yamlToMeta bstr = do + let parser = do + meta <- yamlBsToMeta bstr + return $ runF meta defaultParserState + parsed <- readWithM parser def "" + case parsed of + Right result -> return result + Left e -> throwError e + yamlBsToMeta :: PandocMonad m => BS.ByteString -> MarkdownParser m (F Meta) yamlBsToMeta bstr = do pos <- getPosition case YAML.decodeNode' YAML.failsafeSchemaResolver False False bstr of - Right [YAML.Doc (YAML.Mapping _ o)] -> (fmap Meta) <$> yamlMap o + Right ((YAML.Doc (YAML.Mapping _ o)):_) -> (fmap Meta) <$> yamlMap o Right [] -> return . return $ mempty Right [YAML.Doc (YAML.Scalar YAML.SNull)] -> return . return $ mempty Right _ -> do |